EP3551416B1 - Maschine und verfahren zur formung von vorformen durch spritzprägen - Google Patents

Maschine und verfahren zur formung von vorformen durch spritzprägen Download PDF

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Publication number
EP3551416B1
EP3551416B1 EP17822378.0A EP17822378A EP3551416B1 EP 3551416 B1 EP3551416 B1 EP 3551416B1 EP 17822378 A EP17822378 A EP 17822378A EP 3551416 B1 EP3551416 B1 EP 3551416B1
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EP
European Patent Office
Prior art keywords
carriage
moulding
core
frame
molding
Prior art date
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Application number
EP17822378.0A
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English (en)
French (fr)
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EP3551416A1 (de
Inventor
Yves-Alban Duclos
Michel Norture
Gilles HELIX
Olivier Lamare
Emilie Grossin
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Sidel Participations SAS
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Sidel Participations SAS
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Publication of EP3551416A1 publication Critical patent/EP3551416A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/03—Injection moulding apparatus
    • B29C45/04—Injection moulding apparatus using movable moulds or mould halves
    • B29C45/06—Injection moulding apparatus using movable moulds or mould halves mounted on a turntable, i.e. on a rotating support having a rotating axis parallel to the mould opening, closing or clamping direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/03—Injection moulding apparatus
    • B29C45/04—Injection moulding apparatus using movable moulds or mould halves
    • B29C45/06—Injection moulding apparatus using movable moulds or mould halves mounted on a turntable, i.e. on a rotating support having a rotating axis parallel to the mould opening, closing or clamping direction
    • B29C2045/065—Injection moulding apparatus using movable moulds or mould halves mounted on a turntable, i.e. on a rotating support having a rotating axis parallel to the mould opening, closing or clamping direction continuously rotating turntables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/03—Injection moulding apparatus
    • B29C45/04—Injection moulding apparatus using movable moulds or mould halves
    • B29C45/06—Injection moulding apparatus using movable moulds or mould halves mounted on a turntable, i.e. on a rotating support having a rotating axis parallel to the mould opening, closing or clamping direction
    • B29C2045/067—Injection moulding apparatus using movable moulds or mould halves mounted on a turntable, i.e. on a rotating support having a rotating axis parallel to the mould opening, closing or clamping direction one mould being openable during clamping of the other moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/258—Tubular

Definitions

  • the invention relates to the field of molding plastic preforms intended for the manufacture of containers (in particular bottles) by blow molding or stretch blow molding.
  • Such a preform generally comprises a body of cylindrical shape, and a neck in the extension of the body at an upper end of the latter. At an opposite lower end, the body is closed by a dome-shaped bottom.
  • a preform of this type is conventionally obtained by injecting a plastic material (such as PET) into a mold with the impression of the preform.
  • a plastic material such as PET
  • each mold comprises a mold body imprinted on an outer face of the body of the preform, and an elongated core imprinted on an inner face of the body of the preform.
  • the plastic material initially poured in the form of solid granules into a hopper, is delivered as a hot paste by an injection screw to a molding machine equipped with a plurality of such molds, into which the pasty plastic material is injected. .
  • the European patent application EP 2,585,273 describes such a molding machine, equipped with a plurality of individual units mounted on a carousel and each intended to ensure the molding of a preform. It is stated in this document that the machine is intended to equip an integrated (or combined) production line, in which the containers are directly formed from the barely molded preforms, and not from previously molded and temporarily stored preforms. .
  • a rotary joint ensures the distribution of the material from the source of material to each molding unit, but, given the large number of molding units, this rotary joint is complex to produce and difficult to maintain.
  • the molding machine described in the international application WO 2015/132487 considerably improves the known techniques, because it comprises a plurality of molding units (all mounted on the same carousel) each equipped with a series of cores mounted on a core holder mounted both in rotation and in translation , each molding unit being connected to the rotating joint by a single supply duct for the plastic material coming from the extruder.
  • the structure of the rotary joint is thereby simplified, the distribution of the plastic material is more efficient, the size is reduced and the productivity maintained or increased.
  • this machine can be improved on several points.
  • the moving masses deserve to be lightened, which would make it possible to reduce their inertia and therefore increase production rates while saving on the energy consumed.
  • this machine allows only one injection molding process to be implemented, while user demand is strong to manufacture preforms by selecting from among several different processes, depending on the application.
  • a shearing of the material is observed at the injection point. This shearing is all the more marked when the thickness of the preforms is reduced (inevitable with the reduction imposed on the one hand by users due to the increase in material costs, and on the other hand by environmental standards, each year more restrictive). This last difficulty is delicate, because the point of injection of the preform remains at the center of the final container, and consequently undergoes significant stresses due to the pressure of the contents.
  • the document EP2022618 describes a machine providing both the injection molding of the preform and the stretch-blow molding of this preform to form a bottle.
  • the document EP0425388 describes a rotary injection molding machine.
  • a first objective is to reduce the moving masses in the preform molding units.
  • a second objective is to reduce the shear stresses applied to the material during injection.
  • a third objective is to provide a molding unit making it possible to implement several molding processes.
  • a fourth objective is to provide a molding technique making it possible to lighten the preforms.
  • This intermediate position makes it possible to inject a volume of material greater than the final volume of the preform.
  • the material is then compressed by the core replaced in its molding position by the return to the lower position of the frame.
  • the impression of the preform is better; the shear stresses of the material at the injection point are minimized; it is therefore possible to reduce the thickness (and therefore the mass) of the preform.
  • the rigid frame ensures that the core holder is held firmly in the retracted position, which makes it possible to minimize the mass of the moving assembly.
  • This machine 1 comprises a rotating carousel 4 , and a plurality of units 5 for molding the preforms 2, all identical, mounted side by side on the carousel 4 and driven in rotation with it.
  • the machine 1 also comprises an extruder 6 arranged to continuously supply the plastic material 3 (in this case PET) to the molding units 5 .
  • this extruder 6 comprises a hopper 7, into which the plastic material is poured in the form of solid granules, a heating system for melting the material, and a cylinder 8 in which is mounted an endless extrusion screw driven in rotation by a motor 9.
  • the hopper 7 opens into the cylinder 8 at an upstream end thereof.
  • the cylinder 8 opens into a duct 10 for connecting the extruder 6 to a rotating joint 11 which distributes, to the molding units 5 , the material in liquid form coming from the extruder 6.
  • the joint 11 is provided with a series of outlets 12 equal in number to devices 5 of molding units.
  • a supply conduit 13 (only one of which is shown on the detail inset on the left on the figure 1 ) which connects the seal 11, via a device 14 dosimetric injection, to a molding unit 5 to deliver the material 3 from the extruder 6.
  • Each preform 2 comprises a body 15 which is substantially cylindrical of revolution about an axis A, an open neck 16 which extends to an upper end of the body 15 from which it is separated by a flange 17, and a hemispherical bottom 18 which closes the body 15 at a lower end opposite the neck 16.
  • the neck 16 ends, opposite the body, by an annular face 19 defining a mouthpiece.
  • Each molding unit 5 comprises, first of all, a frame 20, including a base 21, which extends horizontally in the normal operating position of the machine 1 and by which the molding unit 5 is fixed on the carousel 4, and a bracket 22 rigidly secured to the base 21 and which extends vertically projecting therefrom.
  • the frame 20 (base 21 and bracket 22 ) is advantageously made of steel, preferably a steel with high elastic limit, taking into account the strong stresses to which it is subjected (see below).
  • the frame 20 further comprises a pair of guide rails 23 integral with the console 22, to which they are fixed eg. by means of screws.
  • the molding unit 5 comprises, secondly, a frame 24 comprising a pair of vertical uprights 25 slidably mounted relative to the frame 20 and a pair of horizontal cross members, namely a lower cross member 26 and an upper cross member 27 , rigidly connecting the amounts 25.
  • the uprights 25 are mounted to slide relative to the frame 20, following a predetermined stroke, by means of a pair of lower bearings 28 secured to the base 21, and a pair of upper bearings 29 secured to the console 22.
  • the uprights 25 extend on either side, vertically, of the base 21 which they pass through.
  • the uprights 25 are in the form of cylindrical bars, with a section for example circular.
  • the lower cross member 26 connects the lower ends of the uprights 25, located on a lower side of the base 21.
  • the lower cross member 26 is for example fitted onto rods 30 of the lower end of the uprights 25, of smaller diameter, by being fixed thereto by means of nuts 31 screwed onto the threaded ends of these rods 30.
  • the upper cross member 27 connects the upper ends of the uprights 25, located on an upper side of the base 21, opposite the lower cross member 26 .
  • the upper cross member 27 is for example fitted onto rods 32 of the upper end of the uprights 25, of smaller diameter, by being fixed thereto by means of nuts 31 screwed onto the threaded ends of these rods 30.
  • the upper cross member 27 is pierced with a vertical central bore 33 , the function of which will appear below.
  • Each lower bearing 28 is advantageously in the form of a smooth or ball bush, rigidly fixed to the base 21 by shrinking, screwing or welding (or by any other means making it possible to obtain a rigid and durable attachment).
  • each upper bearing 29 is formed at the end of a flange 34 which extends transversely with respect to the console 22 and is fixed to the latter by screwing or by welding (or by any other means making it possible to obtain a rigid and durable fixation).
  • Each upper bearing 29 can be smooth or ball.
  • the molding unit 5 comprises at least one jack 35 (two in number in the example illustrated) interposed between the frame 20 and the lower cross member 26 . More specifically, each jack 35 comprises a body 36 fixed to a lower face of the base 21, and a rod 37 slidably mounted relative to the body 36 and fixed to the lower cross member 26 . In this way, this (these) cylinder (s) 35 control (s) the displacement of the frame 24, via the lower cross member 26 , in vertical translation between a low position, illustrated on the figures. figures 2 , 5 , 6 , 8 , 9 , 16 , 22 and 23 , and a high position, raised from the low position and illustrated on the figure 13 . The reason for this mobility of the frame will be explained below.
  • the molding unit 5 comprises, thirdly, a mold holder 38 integral with the frame 20 by being fixed to the base 21 (eg by screwing) between the uprights 25.
  • This mold holder 38 incorporates at least one body. 39 mold (visible in section on figure 4 and detailed on figures 11 , 15 and 17 ).
  • the mold body 39 comprises a cylindrical side wall 40 and a hemispherical mold bottom 41 superimposed (and optionally formed, as in the example illustrated, of two separate parts assembled), which together define a cavity 42 to the imprint of an external face of the body 15 of the preform 2.
  • the mold body 39 extends around a molding axis M which coincides with the central axis A of the preform 2 being formed (or just formed).
  • the side wall 40 is extended, opposite the mold base 41 , by a projecting upper section defining a frustoconical reserve 43 in the axial extension of the cavity 42.
  • the mold holder 38 incorporates several mold bodies 39 , in this case six in number, arranged side by side, advantageously along a curved line, such as an arc of a circle, the radius of which corresponds to the radius of a wheel transfer by which the preforms 2 formed are intended to be supported.
  • the movement of the needle 48 is for example controlled by a pneumatic (or hydraulic) cylinder having a piston integral with the needle 48.
  • the mold holder 38 further comprises a pair of drawers 49 each carrying at least one neck half-ring 50 having an internal face to the imprint of the neck 16 of a preform, and a frustoconical external face.
  • each drawer 49 carries a number of half-rings 50 equal to the number of mold bodies 39 - six in the example illustrated on figure 3 .
  • each drawer 49 includes a plate 51 provided, on an internal edge, with a series of semi-circular notches 52 in each of which is housed (by being fixed for example by screwing) a half-ring 50 of the neck.
  • Each half-ring 50 is positioned directly above a mold body 39 , and the half-rings 50 are positioned side by side along the same profile as the mold bodies 39 (in this case following an arc of a circle , as we can clearly see on the figure 3 ).
  • the mold holder 38 comprises a system 53 for guiding each drawer 49, in a guiding direction G inclined relative to the vertical (that is to say relative to the molding axis M ).
  • This system 53 comprises, for each drawer 49, a slide 54 integral with the plate 51 and pierced with an oblong groove 55 , inclined in the guiding direction G, and a roller 56 (such as a ball bearing) integral with the console 22 by means of a support 57 and housed in the groove 55 to roll there from a lower end (in the demolding position, cf. figure 4 ) at an opposite upper end (in the molding position, cf. figure 7 , 10 , 14 ).
  • the guide system 53 further comprises a plate 58 on which the drawers 49 are mounted to slide in a horizontal direction, by means of guide rails 59 .
  • This plate 58 is itself movable in vertical translation relative to the console 22, being mounted to slide on the rails 59.
  • the guide system 53 comprises, lastly, a control jack 60 provided with a body 61 of Cylinder integral with the fixed support 57 , and with a rod 62 mounted to slide relative to the cylinder body 61 and integral, via a bracket 63, with the plate 58.
  • the rod 62 drives with it upwards, via the bracket 63, the plate 58 (which slides on the rails 23 ) and the drawers 49 that she carries.
  • the molding unit 5 comprises, fourthly, a mobile unit 64 , which includes a carriage 65 mounted in translation on the console 22 by means of slides 66 which cooperate with the rails 23 to ensure the vertical linear guidance thereof, and a core holder (s) 67 mounted on the carriage 65, this core holder (s) 67 carrying at least one oblong core 68 to the imprint of an internal face of the preform 2.
  • the (or each) core 68 is intended to fit into the mold body 39 (with the drawers 49 in the molding position) so as to define, together with it and the neck half-rings 50 , the complete counter-impression of a preform 2.
  • each core 68 is hollow and comprises an outer casing 69 (imprinted with the inner face of the preform 2 ) and a core 70, housed in the outer casing 69 and which defines an injection duct 71 of a coolant (typically water) for maintaining the temperature of the casing 69 at a moderate value (e.g. between 10 ° C and 20 ° C) for cooling the injected plastic material 3.
  • a coolant typically water
  • the heart 70 is provided, at a lower end, with notches 72 through which the heat transfer fluid flows into an interstice 73 formed between the core 70 and the casing 69 to be discharged after having carried out a heat exchange with the hot material 3 that it thus helps to cool.
  • the core holder 67 carries at least one row of cores 68 comprising a number of cores 68 equal to the number of mold bodies 39 , these cores 68 extending side by side along the line. same profile (here curved, and more precisely circular) and the same spacing as the bodies 39 of molds in which they are intended to be housed.
  • the core holder 67 carries two identical rows of cores 68, namely a primary row and a secondary row, and the core holder 67 is mounted in rotation with respect to the carriage 65, between a primary alignment position in which the cores 68 of the primary row are aligned with the mold bodies 39 while the cores 68 of the secondary row are spaced therefrom, and a secondary alignment position, rotated 180 ° by relative to the primary alignment position and in which it is the cores 68 of the secondary row which are aligned with the mold bodies 39 while the cores 68 of the primary row are separated therefrom.
  • the core holder 67 is integral with a pin 74 housed in a bore formed in the carriage 65 with the interposition of bearings (such as ball bearings).
  • the axis 74 carries a pinion 75 on which circulates a belt 76 driven by a motor 77.
  • the motor 77 is started for a predetermined time.
  • the motor 77 drives the belt 76, which, meshing the pinion 75, causes the rotation of the axis 74 and thus of the core holder 67 according to an angular amplitude of 180 °, either clockwise or counterclockwise.
  • the motor 77 is advantageously of the brushless type, which offers the advantage of being angularly precise.
  • the suspension of the core holder 67 from the carriage 65 is for example carried out by means of one or more circlips mounted on the axis 74 and forming a stopper for the latter on one (or more) shoulder (s) formed on the carriage 65.
  • the translational movement of the carriage 65 is controlled by an upper cam path 79 with which cooperates a cam follower 80 (in this case in the form of a roller) mounted on the carriage 65.
  • the upper cam path 79 illustrated dotted on the figure 5 , extends to the periphery of the carousel 4, over at least an angular portion of the path of the molding unit 5 .
  • This cam path 79 comprises a low portion 79A , which when the cam follower 80 is there, allows the carriage 65 to adopt its molding position under the effect of its own weight ( figure 8 ), and a raised portion 79B which, when the cam follower 80 is there, lifts the carriage 65 to place it in its demoulding position ( figure 5 ).
  • the mobile assembly 64 is also provided with a shaft 81 integral with the carriage, this shaft 81 being housed (with the possibility of sliding, under conditions which will be explained below) in the bore. 33 of the upper cross member 27 .
  • the shaft 81 extends directly over the mold holder 38.
  • the mobile unit 64 can be free to slide vertically with respect to the frame 24, or on the contrary be immobilized with respect to the latter.
  • the frame 24 is provided with a latch 82 movable between an unlocking position in which it is spaced from the bore 33 to release the shaft 81 and thus allow the mobile assembly 64 to slide relative to the frame 24 ( figures 8 , 20, 21 ), and a locking position in which the lock 82 extends to the right of the bore 33 to block the shaft 81 (and therefore the mobile assembly 64 ) in translation ( figures 9 , 13 , 16 ).
  • the lock 82 is formed at a free end of an arm 83 mounted to pivot relative to one of the uprights 25.
  • the arm 83 carries a cam follower 84 (here in the form of a roller) which cooperates with an internal cam 85 (in dotted lines on the figure 20 ), fixed relative to the carousel 4, and which has a recessed portion 85A which, when the roller 84 is there, places the latch 82 in the unlocking position, and a projecting portion 85B which, when the roller 84 s 'there, places the latch 82 in the locked position.
  • the arm 83 can be bent, and the latch 82 is for example in the form of a plate fixed to the arm 83 and provided with a notch 86 complementary to the guide shaft 81 , to be able to let the latter slide by relative to the upper cross member 27 (and therefore relative to the frame 24 ).
  • the frame 24 is provided with a bracket 87 integral with the upper cross member 27 , on a lower face of which it is fixed (eg by means of screws).
  • This U-shaped yoke 87 has an opening 88 in which the latch 82 slides freely , and a hole 89 coaxial with the bore 33, in which the shaft 81 for guiding the carriage 65 can slide .
  • the shaft 81 When the carriage 65 is in its molding position, the shaft 81 has come out of the bore 33, its upper end being housed in the hole 89 of the caliper 87, from which it does not protrude. Under these conditions, the lock 82 can be freely moved from its unlocked position to its locked position, and vice versa.
  • the latch 82 When the latch 82 is placed (by the roller 84 circulating in the projecting portion 85B of the internal cam 85 ) in its locking position where, housed in the opening 88 of the caliper 87, it closes the passage between the hole 89 and the bore 33, it prevents any upward translation of the shaft 81 (and therefore of the carriage 65 ).
  • the latch 82 In the low position of the frame 24, the latch 82, itself in the locking position, blocks the carriage 65 in its molding position.
  • the latch 82 which remains in the locking position blocks the carriage 65 (and each core 68 ) in a position withdrawal, illustrated on figures 13 , 14 and 15 , intermediate between the molding position and the release position and in which the core 68 is partially housed in the mold body 39 .
  • Can for this purpose drive the carriage 65 upwardly by mechanical means (eg. By a transitional portion of the cam 79 on which upper rolling roller 80), or let the injection pressure of the plastic material 3 repel. Under these conditions, the lock 82 forms for the shaft 81 (and therefore for the carriage 65 ) an end stop.
  • each core 68 i.e. of the carriage 65
  • the molding position dotted on the figure 15
  • the withdrawal position is a function of the volume of the preform 2 (that is to say of its dimensions).
  • this stroke is a few tens of millimeters, typically of the order of 45 mm.
  • the deployed position of the extractor 91 makes it possible to take off the preforms 2 from their respective cores 68 in order to remove them from the molding unit 5 (see below).
  • the deployed position of the extractor 91 allows it to remain applied against the mold holder 38, and more precisely against the half-rings 50 to keep the cavity 42 hermetically closed when the carriage 65 is placed. in the retracted position by raising the frame 24 to its upper position.
  • Each extractor 91 is slidably mounted relative to the core holder 67 by means of guide fingers 92 which pass through the latter and are connected two by two by connecting bars 93 .
  • Return springs 94 are mounted on the fingers 92 being interposed between the core holder 67 and the connecting bar 93 to permanently urge the extractor 91 towards its retracted position.
  • the stripping device 90 comprises a primary actuator 95 , mounted on the carriage 65 in line with the cores 68 in the primary alignment position, and movable between a retracted position (adopted in the molding position of the carriage 65 ), in which the The primary actuator 95 allows the extractor 91 to adopt its retracted position, and a deployed position (adopted in the retracted position of the carriage 65 ), in which the primary actuator 95 places, by pressing against the guide fingers 92 , the extractor 91 in the deployed position to keep the cavity 42 closed .
  • the primary actuator 95 is in the form of a jack comprising a jack body 96 integral with the carriage 65, and a jack rod 97 slidably mounted relative to the jack body 96 .
  • the stripping device 90 further comprises a secondary actuator 98 , mounted on the carriage 65 in line with the cores 68 placed in the secondary alignment position, and mounted movably between a retracted position (adopted in the molding position of the carriage 65 ). , in which the secondary actuator 98 allows the extractor 91 to adopt its retracted position, and a deployed position (adopted in the retracted position of the carriage 65 ), in which the secondary actuator 98 places, by pressing against the fingers 92 guide, the extractor 91 in the deployed position.
  • this secondary actuator 98 is in the form of a cylinder comprising a cylinder body 99 integral with the carriage 65, and a cylinder rod 100 mounted to slide vertically relative to the cylinder body 99 and carrying, at its free end, a bar 101 transverse fitted with pushers 102.
  • the pushers 102 come to press (vertically, downward) on the connecting bars 93 and, by their intermediate, place the extractor 91 in its deployed position ( figure 19 ) to strip the preforms 2 from their respective cores 68 .
  • the molding unit 5 comprises, fifthly, a device 103 for gripping the molded preforms 2 thus stripped of their cores 68.
  • This gripping device 103 clearly visible on the figures 3 , 18 and 19 , comprises a support 104 mounted to slide vertically on the base 21 via a slide 105 (visible on the figure 10 ), between a high position (cf. in particular figures 18 and 19 ) and a low position ( figure 23 ).
  • the gripping device 103 comprises a pair of combs 106 which together define a series of grippers 107 for gripping the preforms 2, located directly above the cores 68 placed in the secondary alignment position, and are arranged according to an identical profile ( curve, and more precisely circular in the example illustrated).
  • These combs 106 are slidably mounted transversely between a release position in which the grippers 107 are open to allow the preforms 2 formed to be brought vertically to their level, and also to allow the preforms 2 to then be supported by a wheel (or any other device) for external transfer, and a gripping position in which the preforms 2 are held by the clamps 107 under their collar 17.
  • the gripping device 103 carries a cam follower 108 (here in the form of a roller, such as a ball bearing), which cooperates with a lower cam 109 external to the carousel 4, fixed relative to the latter, to alternately placing the gripping device 103 in its high position (where the preforms 2 will be gripped by the grippers 107 ) and in its low position (where the preforms 2 will be supported by the wheel - or the device - of external transfer).
  • a cam follower 108 here in the form of a roller, such as a ball bearing
  • the use of the molding unit 5 for the manufacture of a preform 2 will now be described, starting from the configuration, illustrated in FIG. figure 2 , in which the preforms 2 have just been removed from the mold, the core holder 67 being rotated to place the row of cores 68 covered with preforms 2 in a secondary alignment position directly above the gripping device 103 (the preforms 2 previously held by the latter having just been supported by the wheel or the external transfer device), and to place the cores 68 bare in primary alignment position.
  • the frame 24 is in its low position.
  • the roller 84 controlling the lock 82 cooperates with the portion 85A set back from the internal cam 85 , so that the lock 82 is in its unlocked position.
  • the roller 80 of the carriage 65 cooperates with the raised portion 79B of the upper cam path 79 , so that the mobile assembly 64 is at the top end of its travel, the guide shaft 81 being housed in the bore 33 of the cross member. 27 upper.
  • the drawers 49 are in the demoulding position ( figures 3 , 4 ).
  • the gripping device 103 is in its lower position and the grippers 107 are open in the release position.
  • the primary actuator 95 is in the retracted position, as is the extractor 91.
  • the core holder 67 is first rotated (by means of the motor 77 which, through the belt 76 and the pinion 75, rotates the axis 74 ) to a position where the cores 68 bare are placed in the primary alignment position and the cores 68 coated with preforms 2 in the secondary alignment position. Simultaneously, the drawers 49 are placed in the molding position.
  • the cylinder rod 62 is retracted into the cylinder body 61 , which causes the lowering of the plate 58 with the drawers 49 and, by oblique sliding of the grooves 55 on their respective rollers 56 , the bringing together of the drawers 49 the neck half-rings 50 of which are thus positioned in the tapered reserves 43 to complete, with the mold bodies 39 , the imprint of the external face of the 2 preforms ( figures 5 , 6 , 7 ).
  • the roller 80 of the carriage 65 passes from the raised portion 79B of the upper cam path 79 to its lower portion 79A .
  • the carriage 65 descends, under its own weight to which is added that of the core holder (x) 67, towards its molding position by sliding on the rails 23.
  • the cores 68 come to be housed in their respective mold bodies 39 to complete the footprint of the preforms 2 ( figures 8 , 10 , 11 ).
  • the guide shaft 81 comes out of the bore 33 and comes to be housed in the hole 89 of the caliper 87, under the opening 88 ( figure 21 ).
  • the gripping device 103 rises to its upper position, the clamps 107 remaining open in the release position.
  • the lock 82 initially in the unlocked position ( figure 20 ), then switches to the locked position when the roller 84 reaches the the projecting portion 85B of the internal cam 85 , which blocks the shaft 81, and therefore the carriage 65, in translation ( figure 9 ).
  • the needle 48 is translated to its injection position, while the dosimetric injection device 14 is actuated to deliver the material 3.
  • the material 3 pushed out of the duct 46 then spreads, via the hole 47 thus released, into the cavity 42, as illustrated in figure 12 by the honeycomb pattern.
  • the frame 24 is moved to its upper position.
  • the jacks 35 are actuated to bring in their respective rods 37 .
  • the pressure of the material 3 injected into the cavity 41 exerts on the cores 68 (and therefore on the core holder 67 and the carriage 65 ) an upward force.
  • the carriage 65 is moved to its retracted position in which it is blocked by the stop of the end of the shaft 81 against the latch 82 held in the locking position ( figures 13 , 14 , 15 ).
  • the primary actuator 95 of the stripping device 90 is moved to its deployed position, which places in the deployed position the extractor 91 of the cores 68 which are in the primary alignment position.
  • the drawers 49 are blocked (with the half-rings 50 ) in the molding position, a position which they could not maintain, under the pressure of the material 3, thanks only to the resistant force of the control cylinder 60 .
  • the volume of material injected into the cavity 42 is approximately 25% greater than the final volume of the preform 2. This surplus corresponds to the volume swept by the core 68 between its molding position (in dotted lines on the figure 15 ) and its retracted position (in solid line on the figure 15 ).
  • the material 3 In contact with the mold body 39 and the core 68, the temperature of which is regulated to a moderate value (between 10 ° C. and 20 ° C.), the material 3 immediately cools. This results in a decrease in its volume.
  • the frame 24 is then replaced in the low position.
  • the jacks 35 are actuated to bring out their respective rods 37 .
  • the latch 82 held in the locked position, presses on the end of the guide shaft 81 , which, integral in translation with the carriage 65, drives the latter in its downward movement.
  • the carriage 65 returns (with the cores 68 ) to its molding position ( figure 16 ).
  • the cores 68 then compress the material against the bottom 41 of the mold and against the wall 40, the loss of volume due to cooling of which is thus compensated ( figure 17 ).
  • the secondary actuator 98 of the stripping device 90 is deployed, which places in the deployed position the extractor 91 of the preforms 2 which are in the secondary alignment position, while the gripping device 103 retracts vertically. an equal distance ( figure 18 ). As the cores 68 retain their positions, the preforms 2 are detached therefrom.
  • the grippers 107 are closed in the gripping position on the preforms 2, while the secondary actuator 98 returns to its retracted position (with the extractor 91, biased towards this position by the return force of the springs 94 ).
  • the gripping device 103 is then translated vertically towards its lower position, the cores 68 thus being completely stripped of their preforms 2, which remain gripped by the grippers 107.
  • the drawers 49 are, by means of their control cylinder 60 , moved to their demoulding position to allow the evacuation of the molded preforms 2 , and the latch 82 moved to its unlocked position to allow the carriage 65 to be raised ( figure 22 ).
  • the roller 80 rises towards the raised portion 79B of the upper cam track 79 , and thus drives the carriage 65 (with the core holder 67 and the cores 68 clad in the preforms 2 barely. demoulded) to the demoulding position ( figure 23 ).
  • the cycle can then start again.
  • transiently retracting the core 68 during injection facilitates the flow of material 3 through the injection point (i.e., hole 47 ).
  • the material which cools on contact with the surfaces cold (bottom of mold and wall, core) sees, at the interface with these, its viscosity increase and slow down the flow to the heart.
  • This flow brake is all the more pronounced as the gap between the core and the mold base is reduced (which is a constraint made necessary by the lightening of the preforms imposed by the evolution of the research market. material savings).
  • the volume temporarily released by the withdrawal of the core 68 is taken advantage of to reduce the shear stresses applied to the material in order to promote its rapid flow through the core.
  • the compression of the material 3 at the end of the injection compensates for the reduction in volume due to the cooling, and consequently promotes the impression taking of the preform 2 by reducing the risk of the appearance of bubbles. It is therefore possible to thin the wall of the preforms 2 (in particular at the level of the bottom 18 ) while maintaining (or even improving) their mechanical performance: good blowing, good mechanical strength during forming.
  • the core holder 67 can be moved without difficulty from its withdrawn position to its molding position (during the compression of the material 3 ) despite the significant stresses induced by the pressure of the material 3 injected into the cavity 42.
  • the positioning of the guide shaft 81 (on which the forces of compression transmitted, via the bolt 82, by the mobile frame 24 ) directly above the mold holder 38, optimizes the force channels by minimizing the torque effects liable to generate bending forces on the mobile unit 64 and / or shear.

Claims (10)

  1. Einheit (5) zur Formung von Vorformlingen (2) aus Kunststoff (3), wobei jeder Vorformling (2) einen Körper (15) und einen Hals (16) in der Verlängerung des Körpers (15) aufweist, diese Einheit (5) umfassend:
    - ein Gestell (20);
    - einen Formträger (38), der mit dem Gestell (20) fest verbunden ist und mindestens einen Formkörper (39) mit dem Abdruck einer Außenfläche des Körpers (15) des Vorformlings (2) aufweist, wobei sich dieser Formkörper (39) um eine Formungsachse (M) erstreckt;
    - eine bewegbare Ausrüstung (64), die einen Schlitten (65) aufweist, und einen Kernträger (67), der auf dem Schlitten (65) angebracht ist, wobei dieser Kernträger (67) mindestens einen länglichen Kern (68) mit dem Abdruck einer Innenfläche des Vorformlings (2) trägt, wobei der Schlitten (65) bezogen auf das Gestell (20) zwischen folgenden Positionen translatorisch bewegbar gelagert ist:
    o einer Formungsposition, wobei der Kern (68) in den Formkörper (39) eingetaucht ist, und
    o einer Entformungsposition, wobei der Kern (68) axial vom Formkörper (39) entfernt ist,
    wobei diese Formungseinheit (5) dadurch gekennzeichnet ist, dass die bewegbare Ausrüstung (64) ein Führungwelle (81) umfasst, die mit dem Schlitten (65) fest verbunden ist, und dadurch, dass sie einen Rahmen (24) umfasst, der ein Paar Pfosten (25) und ein Paar Querelemente (26, 27), die die Pfosten (25) starr verbinden, aufweist, wobei eins der Querelemente (26, 27) von einer Bohrung (33) durchbohrt ist, die die Führungswelle (81) aufnimmt, wobei der Rahmen (24) mit einer Verriegelung (82) versehen ist, die zwischen einer Verriegelungsposition, wobei sie sich senkrecht zur Bohrung (33) erstreckt, um die Welle (81) translatorisch zu blockieren, und einer Entriegelungsposition, wobei die Verriegelung (82) von der Bohrung (33) entfernt ist, um die Welle (81) freizugeben, bewegbar ist, wobei dieser Rahmen (24) bezogen auf das Gestell (20) zwischen folgenden Positionen translatorisch bewegbar ist:
    - einer unteren Position, wobei die Verriegelung (82) in der Verriegelungsposition den Schlitten (65) in seiner Formungsposition blockiert, und
    - einer oberen Position, wobei die Verriegelung (82) in der Verriegelungsposition den Schlitten (65) in einer Rückzugsposition zwischen der Formungsposition und der Entformungsposition blockiert, und wobei der Kern (68) teilweise im Formkörper (39) aufgenommen ist.
  2. Formungseinheit (5) nach Anspruch 1, dadurch gekennzeichnet, dass sie mindestens einen Zylinder (35) zur Steuerung der Bewegung des Rahmens (24) umfasst, der zwischen dem Gestell (20) und dem unteren Querelement (26) eingefügt ist.
  3. Formungseinheit (5) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Gestell (20) einen Sockel (21) umfasst, auf dem der Formträger (38) angebracht ist, und eine Konsole (22), die sich vom Sockel (21) abstehend erstreckt, wobei die Konsole (22) Schienen (23) zur Führung des Schlittens (65) trägt, und dadurch, dass die Pfosten (25) mittels eines Paares von unteren Lagern (28), die mit dem Sockel (21) fest verbunden sind, und eines Paares von oberen Lagern (29), die mit der Konsole (22) fest verbunden sind, bezogen auf das Gestell (20) gleitend gelagert sind.
  4. Formungseinheit (5) nach Anspruch 3, dadurch gekennzeichnet, dass jedes obere Lager (29) am Ende eines Flansches (34) ausgebildet ist, der an der Konsole (22) befestigt ist.
  5. Formungseinheit (5) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Verriegelung (82) an einem freien Ende eines Arms (83) ausgebildet ist, der bezogen auf einen der Pfosten (25) schwenkbar gelagert ist.
  6. Formungseinheit (5) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Kernträger (67) zwei Reihen von Kernen (68) trägt und bezogen auf den Schlitten (65) drehbar gelagert ist, um abwechselnd jede Reihe von Kernen (68) in die Formungsachse (M) zu bringen.
  7. Formungseinheit (5) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die bewegbare Ausrüstung (64) eine Abnahmevorrichtung (90) umfasst, die einen Extraktor (91) aufweist, der bezogen auf den Kernträger (67) zwischen einer eingefahrenen Position, die in der Formungsposition des Schlittens (65) eingenommen wird, wobei der Extraktor (91) an den Kernträger (67) angelegt ist, und einer ausgefahrenen Position, die in der Rückzugsposition des Schlittens (65) eingenommen wird, wobei der Extraktor (91) von dem Kernträger (67) entfernt ist, wobei er in Anlage an den Formträger (38) gehalten wird, translatorisch bewegbar gelagert ist.
  8. Formungseinheit (5) nach Anspruch 7, dadurch gekennzeichnet, dass der Extraktor (91) bezogen auf den Kernträger (67) mittels Führungsfingern (92) gleitend gelagert ist, die diesen unter Zwischenschaltung von Rückholfedern (94) durchqueren, und dadurch, dass die Abnahmevorrichtung (90) mindestens einen Aktor (95, 98) umfasst, der zwischen einer eingefahrenen Position, die in der Formungsposition des Schlittens (65) eingenommen wird, wobei es der Aktor (95, 98) dem Extraktor (91) gestattet, seine eingefahrene Position einzunehmen, und einer ausgefahrenen Position, die in der Rückzugsposition des Schlittens (65) eingenommen wird, wobei der Aktor (95, 98) durch Anlage an den Führungsfingern (92) den Extraktor (91) in die ausgefahrene Position bringt.
  9. Maschine (1) zur Formung von Vorformlingen aus Kunststoff (3), die Folgendes umfasst:
    - ein Drehkarussell (4),
    - eine Mehrzahl von Formungseinheiten (5) nach einem der vorhergehenden Ansprüche, die auf dem Karussell (4) angebracht sind,
    - einen Extruder (6),
    - eine Drehverbindung (11), die mit einem Eingang, der mit dem Extruder (6) verbunden ist, und einer Mehrzahl von Ausgängen (12), die jeweils durch eine Zufuhrleitung (13) mit einer Formungseinheit (5) verbunden sind, um dieser den Kunststoff (3) zuzuführen, versehen ist.
  10. Verfahren zur Formung von Vorformlingen (2) aus Kunststoff (3) innerhalb einer Formungseinheit (5) nach einem der Ansprüche 1 bis 8, das die folgenden Arbeitsgänge umfasst, die darin bestehen:
    - den Schlitten (65) in Formungsposition, den Rahmen (24) in die untere Position und die Verriegelung (82) in die Verriegelungsposition zu bringen;
    - das Einspritzen von Kunststoff (3) in den oder jeden Formkörper (39) einzuleiten;
    - bei Halten der Verriegelung (82) in der Verriegelungsposition und Fortführung des Einspritzens den Rahmen (24) in die obere Position zu bringen, um den Schlitten (65) in die Rückzugsposition zu bringen;
    - das Einspritzen zu stoppen;
    - den Rahmen (24) wieder in die untere Position zu bringen, um den Schlitten (65) wieder in die Formungsposition zu bringen;
    - die Verriegelung (82) in die Entriegelungsposition zu bringen;
    - den Schlitten (65) in die Entformungsposition zu bringen.
EP17822378.0A 2016-12-12 2017-12-07 Maschine und verfahren zur formung von vorformen durch spritzprägen Active EP3551416B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1662325A FR3053904B1 (fr) 2016-12-12 2016-12-12 Machine et procede de moulage de preformes par injection compression
PCT/FR2017/053430 WO2018109327A1 (fr) 2016-12-12 2017-12-07 Machine et procede de moulage de preformes par injection compression

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EP3551416A1 EP3551416A1 (de) 2019-10-16
EP3551416B1 true EP3551416B1 (de) 2020-10-14

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CN (1) CN110049854B (de)
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Publication number Priority date Publication date Assignee Title
WO2020041886A1 (en) 2018-08-30 2020-03-05 Husky Injection Molding Systems Ltd. Melt dispenser for plastic molding

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4797084A (en) * 1985-11-29 1989-01-10 Nissei Asb Machine Co., Ltd. Mold device for molding a preform
JPH078516B2 (ja) * 1989-10-27 1995-02-01 日精エー・エス・ビー機械株式会社 回転式射出成形機
JPH082586B2 (ja) * 1991-01-31 1996-01-17 日精エー・エス・ビー機械株式会社 回転式成形機
FR2824288B1 (fr) * 2001-05-07 2004-04-02 Hutchinson Presse d'injection pour pieces moulees en elastomere
FR2898294A1 (fr) 2006-03-08 2007-09-14 Eaux Minerales D Evian Saeme S Dispositif d'injection/soufflage pour la fabrication d'un corps creux et procede
JP4837442B2 (ja) * 2006-05-30 2011-12-14 株式会社青木固研究所 射出延伸ブロー成形機
IT1400833B1 (it) 2010-06-25 2013-07-02 Sipa Progettazione Automaz Impianto di produzione di contenitori di plastica
FR3018048B1 (fr) 2014-03-03 2016-05-27 Sidel Participations Unite de moulage de preformes equipee d'un porte-noyaux mobile en rotation

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Title
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Publication number Publication date
CN110049854B (zh) 2021-10-12
EP3551416A1 (de) 2019-10-16
FR3053904A1 (fr) 2018-01-19
FR3053904B1 (fr) 2018-08-17
CN110049854A (zh) 2019-07-23
WO2018109327A1 (fr) 2018-06-21

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